Class: HyperResource

Inherits:
Object
  • Object
show all
Includes:
Enumerable, Modules::HTTP, Modules::InternalAttributes
Defined in:
lib/hyper_resource.rb,
lib/hyper_resource/links.rb,
lib/hyper_resource/adapter.rb,
lib/hyper_resource/objects.rb,
lib/hyper_resource/version.rb,
lib/hyper_resource/attributes.rb,
lib/hyper_resource/exceptions.rb,
lib/hyper_resource/modules/http.rb,
lib/hyper_resource/adapter/hal_json.rb,
lib/hyper_resource/modules/http/wrap_errors.rb

Overview

HyperResource is the main resource base class. Normally it will be used through subclassing, though it may also be used directly.

Direct Known Subclasses

Aptible::Resource::Base

Defined Under Namespace

Modules: Modules Classes: Adapter, Attributes, ClientError, Exception, Link, Links, Objects, Response, ResponseError, ServerError

Constant Summary collapse

VERSION = 
'0.2.5'.freeze
VERSION_DATE = 
'2014-04-02'.freeze

Constants included from Modules::HTTP

Modules::HTTP::CONTENT_TYPE_HEADERS, Modules::HTTP::MAX_COORDINATOR_RETRIES

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Modules::InternalAttributes

included

Methods included from Modules::HTTP

#create, #delete, #get, initialize_http_client!, #patch, #post, #put, #update

Constructor Details

#initialize(opts = {}) ⇒ HyperResource

Create a new HyperResource, given a hash of options. These options include:

root

The root URL of the resource.

auth

Authentication information. Currently only {basic: [‘key’, ‘secret’]} is supported.

namespace

Class or class name, into which resources should be instantiated.

headers

Headers to send along with requests for this resource (as well as its eventual child resources, if any).



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# File 'lib/hyper_resource.rb', line 49

def initialize(opts={})
  return init_from_resource(opts) if opts.kind_of?(HyperResource)

  self.root       = opts[:root] || self.class.root
  self.href       = opts[:href] || ''
  self.auth       = (self.class.auth || {}).merge(opts[:auth] || {})
  self.namespace  = opts[:namespace] || self.class.namespace
  self.headers    = DEFAULT_HEADERS.merge(self.class.headers || {}).
                                    merge(opts[:headers]     || {})

  ## There's a little acrobatics in getting Attributes, Links, and Objects
  ## into the correct subclass.
  if self.class != HyperResource
    if self.class::Attributes == HyperResource::Attributes
      Object.module_eval(
        "class #{self.class}::Attributes < HyperResource::Attributes; end"
      )
    end
    if self.class::Links == HyperResource::Links
      Object.module_eval(
        "class #{self.class}::Links < HyperResource::Links; end"
      )
    end
    if self.class::Objects == HyperResource::Objects
      Object.module_eval(
        "class #{self.class}::Objects < HyperResource::Objects; end"
      )
    end
  end

  self.attributes = self.class::Attributes.new(self)
  self.links      = self.class::Links.new(self)
  self.objects    = self.class::Objects.new(self)

  self.loaded     = false

  self.adapter    = opts[:adapter] || self.class.adapter ||
                    HyperResource::Adapter::HAL_JSON
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

method_missing will load this resource if not yet loaded, then attempt to delegate to attributes, then objects, then links. Override with care.

Raises:

  • (NoMethodError) 


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# File 'lib/hyper_resource.rb', line 143

def method_missing(method, *args)
  self.get unless self.loaded

  method = method.to_s
  if method[-1,1] == '='
    return attributes[method[0..-2]] = args.first if attributes[method[0..-2]]
  else
    return attributes[method] if attributes && attributes.has_key?(method)
    return objects[method] if objects && objects[method]
    if links && links[method]
      if args.count > 0
        return links[method].where(*args)
      else
        return links[method]
      end
    end
  end

  raise NoMethodError, "undefined method `#{method}' for #{self.inspect}"
end

Class Method Details

.get_data_type_from_response(response) ⇒ Object

Inspects the given Faraday::Response, and returns a string describing this resource’s data type.

By default, this method looks for a type=… modifier in the response’s Content-type and returns that value, capitalized.

Override this method in a subclass to alter HyperResource’s behavior.



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# File 'lib/hyper_resource.rb', line 257

def self.get_data_type_from_response(response)
  return nil unless response
  return nil unless content_type = response['content-type']
  return nil unless m=content_type.match(/;\s* type=([0-9A-Za-z:]+)/x)
  m[1][0,1].upcase + m[1][1..-1]
end

.namespaced_class(type_name, namespace) ⇒ Object 



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# File 'lib/hyper_resource.rb', line 225

def self.namespaced_class(type_name, namespace)
  class_name = "#{namespace}::#{type_name}"
  class_name.gsub!(/[^_0-9A-Za-z:]/, '')  ## sanitize class_name

  ## Return data type class if it exists
  klass = eval(class_name) rescue :sorry_dude
  return klass if klass.is_a?(Class)

  ## Data type class didn't exist -- create namespace (if necessary),
  ## then the data type class
  if namespace != ''
    nsc = eval(namespace) rescue :bzzzzzt
    unless nsc.is_a?(Class)
      Object.module_eval "class #{namespace} < #{self}; end"
    end
  end
  Object.module_eval "class #{class_name} < #{namespace}; end"
  eval(class_name)
end

.response_class(response, namespace) ⇒ Object

Returns the class into which the given response should be cast. If the object is not loaded yet, or if namespace is not set, returns self.

Otherwise, response_class uses get_data_type_from_response to determine subclass name, glues it to the given namespace, and creates the class if it’s not there yet. E.g., given a namespace of FooAPI and a response content-type of “application/vnd.foocorp.fooapi.v1+json;type=User”, this should return FooAPI::User (even if FooAPI::User hadn’t existed yet).



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# File 'lib/hyper_resource.rb', line 212

def self.response_class(response, namespace)
  if self.to_s == 'HyperResource'
    return self unless namespace
  end

  namespace ||= self.to_s

  type_name = self.get_data_type_from_response(response)
  return self unless type_name

  namespaced_class(type_name, namespace)
end

Instance Method Details

#[](i) ⇒ Object

Returns the *i*th object in the first collection of objects embedded in this resource. Returns nil on failure.



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# File 'lib/hyper_resource.rb', line 126

def [](i)
  get unless loaded
  self.objects.first[1][i]
end

#_hr_new_from_link(href) ⇒ Object

Return a new HyperResource based on this object and a given href.



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# File 'lib/hyper_resource.rb', line 192

def _hr_new_from_link(href) # @private
  self.class.new(:root            => self.root,
                 :auth            => self.auth,
                 :headers         => self.headers,
                 :namespace       => self.namespace,
                 :token           => self.token,
                 :href            => href)
end

#_hr_response_class ⇒ Object 



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# File 'lib/hyper_resource.rb', line 245

def _hr_response_class # @private
  self.namespace ||= self.class.to_s unless self.class.to_s=='HyperResource'
  self.class.response_class(self.response, self.namespace)
end

#changed?(*args) ⇒ Boolean

Returns true if one or more of this object’s attributes has been reassigned.

Returns:

  • (Boolean) 


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# File 'lib/hyper_resource.rb', line 92

def changed?(*args)
  attributes.changed?(*args)
end

#deserialized_response ⇒ Object 



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# File 'lib/hyper_resource.rb', line 183

def deserialized_response # @private
  _hr_deprecate('HyperResource#deserialized_response is deprecated. '+
                'Please use HyperResource#body instead.')
  body
end

#each(&block) ⇒ Object

Iterates over the objects in the first collection of embedded objects in this resource.



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# File 'lib/hyper_resource.rb', line 133

def each(&block)
  get unless loaded
  self.objects.first[1].each(&block)
end

#get_data_type_from_response ⇒ Object

Uses HyperResource.get_response_data_type to determine the proper data type for this object. Override to change behavior (though you probably just want to override the class method).



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# File 'lib/hyper_resource.rb', line 267

def get_data_type_from_response
  self.class.get_data_type_from_response(self.response)
end

#incoming_body_filter(attr_hash) ⇒ Object

incoming_body_filter filters a hash of attribute keys and values on their way from a response body to a HyperResource. Override this in a subclass of HyperResource to implement filters on incoming data.



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# File 'lib/hyper_resource.rb', line 102

def incoming_body_filter(attr_hash)
  attr_hash
end

#inspect ⇒ Object 



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# File 'lib/hyper_resource.rb', line 165

def inspect # @private
  "#<#{self.class}:0x#{"%x" % self.object_id} @root=#{self.root.inspect} "+
  "@href=#{self.href.inspect} @loaded=#{self.loaded} "+
  "@namespace=#{self.namespace.inspect} ...>"
end

#outgoing_body_filter(attr_hash) ⇒ Object

outgoing_body_filter filters a hash of attribute keys and values on their way from a HyperResource to a request body. Override this in a subclass of HyperResource to implement filters on outgoing data.



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# File 'lib/hyper_resource.rb', line 109

def outgoing_body_filter(attr_hash)
  attr_hash
end

#outgoing_uri_filter(attr_hash) ⇒ Object

outgoing_uri_filter filters a hash of attribute keys and values on their way from a HyperResource to a URL. Override this in a subclass of HyperResource to implement filters on outgoing URI parameters.



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# File 'lib/hyper_resource.rb', line 117

def outgoing_uri_filter(attr_hash)
  attr_hash
end

#response_body ⇒ Object

response_body, response_object, and deserialized_response

are deprecated in favor of +body+.  (Sorry. Naming things is hard.)



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# File 'lib/hyper_resource.rb', line 173

def response_body # @private
  _hr_deprecate('HyperResource#response_body is deprecated. '+
                'Please use HyperResource#body instead.')
  body
end

#response_object ⇒ Object 



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# File 'lib/hyper_resource.rb', line 178

def response_object # @private
  _hr_deprecate('HyperResource#response_object is deprecated. '+
                'Please use HyperResource#body instead.')
  body
end